| 1 | <?php |
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| 10 | class UnsetCast extends AbstractExpressionCompiler |
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| 11 | { |
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| 12 | protected $name = 'PhpParser\Node\Expr\Cast\Unset_'; |
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| 13 | |||
| 14 | /** |
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| 15 | * (unset) {$expr} |
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| 16 | * |
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| 17 | * @param \PhpParser\Node\Expr\Cast\Unset_ $expr |
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| 18 | * @param Context $context |
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| 19 | * @return CompiledExpression |
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| 20 | */ |
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| 21 | 1 | protected function compile($expr, Context $context) |
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| 27 | } |
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| 28 |
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.